78328904197 has 2 divisors, whose sum is σ = 78328904198. Its totient is φ = 78328904196.

The previous prime is 78328904123. The next prime is 78328904231. The reversal of 78328904197 is 79140982387.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75529330276 + 2799573921 = 274826^2 + 52911^2 .

It is a cyclic number.

It is not a de Polignac number, because 78328904197 - 2¹⁵ = 78328871429 is a prime.

It is a super-2 number, since 2×78328904197² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78328934197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39164452098 + 39164452099.

It is an arithmetic number, because the mean of its divisors is an integer number (39164452099).

Almost surely, 2^78328904197 is an apocalyptic number.

It is an amenable number.

78328904197 is a deficient number, since it is larger than the sum of its proper divisors (1).

78328904197 is an equidigital number, since it uses as much as digits as its factorization.

78328904197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6096384, while the sum is 58.

The spelling of 78328904197 in words is "seventy-eight billion, three hundred twenty-eight million, nine hundred four thousand, one hundred ninety-seven".